Analysis of an on-line superconducting cryofan motor for indirect cooling by LH2

27th International Cryogenics Engineering Conference and International Cryogenic Materials Conference 2018

Climente-Alarcon, V.^1 ; Baskys, A.^1 ; Patel, A.^1 ; Glowacki, B.A.^1^2^3

Department of Materials Science and Metallurgy, University of Cambridge, Cambridge

CB3 0FS, United Kingdom^1

Institute of Power Engineering, Warsaw

02-981, Poland^2

Epoch Wires Ltd, UK, Cambridge

CB22 6SA, United Kingdom^3

关键词: Closed loops;    Critical temperatures;    Driving torques;    Fan rotors;    High temperature superconducting;    Indirect cooling;    Iron components;    Reluctance torque;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/502/1/012050/pdf
DOI  :  10.1088/1757-899X/502/1/012050

来源: IOP

【 摘 要 】

This work relates to the study of an electrically powered cryofan for circulating closed-loop cooling helium gas for superconducting applications with the following features:-Absence of any seal that can leak the pumped fluid or provide a path for heat transfer and require maintenance and/or is prone to failures.-The use of high temperature superconducting (HTS) stacks on the fan-rotor that, below critical temperature, can be magnetized contributing to the driving torque. The absence of electrically connected equipment as well as the lack of any seal, makes this arrangement especially suitable for reliable cryogenic helium gas circulation. Because HTS stacks cannot provide magnetic flux above T c, during the initial stages of operation, in the presented study we analyse the torque that will be provided by the passive iron components of the machine (reluctance torque, due to the saliency of the rotor) and by auxiliary permanent magnets or alternatively magnetizing coils.Published under licence by IOP Publishing Ltd.